Question: Which symbiotic characters were introduced in the two-part episode of Spider-Man? 

Context paragraphs:
Time Stands Still (Degrassi: The Next Generation): "Time Stands Still" is a two-part episode of the Canadian teen drama "".  It aired near the beginning of the fourth season, and originally aired on 5 and 12 October 2004 in Canada, on the CTV Television Network.  Despite being a two-part episode, many events were still unresolved until later in the season.  The American teen network, The N, which aired first run episodes, was airing episodes two months later at the time.

List of NCIS episodes: "NCIS" and its characters were originally introduced in a two-part episode of the CBS television series "JAG" in April 2003 .  The show premiered on September 23 , 2003, in the United States.

List of NCIS: Los Angeles episodes: "" is an American television series that premiered on CBS on September 22, 2009.  The series is set in Los Angeles, California, and follows the stories of the members of the Office of Special Projects, an undercover division of the Naval Criminal Investigative Service (NCIS).  The program and its characters were introduced in a two-part episode during the sixth season of the television series "NCIS" on April 28 and May 5, 2009.

Spider-Man: The Venom Saga: Spider-Man: The Venom Saga is the title used by a particular story arc from the 1994 animated series "Spider-Man" that focused on Venom.  The description of the name and chosen episodes debuted in home media by Buena Vista Home Entertainment.  The first three episodes is a three-part episode entitled "The Alien Costume" from season one.  The last two is a two-part episode entitled "Venom Returns" and "Carnage" which debuted in season three.  These certain episodes are responsible for debuting the symbiotic characters Venom and Carnage outside of comic books.

The Menagerie (Star Trek: The Original Series): "The Menagerie" is a two-part episode of the American science fiction television series, "".  It consists of episodes 11 and 12 (production #16) of the show's and is the only two-part story in the original series.  Part one of the episode was broadcast on November 17, 1966, with part two broadcast on November 24, 1966.  NBC repeated the two shows on May 18 and 25, 1967.  The episode was written by Gene Roddenberry.

Symbiote (comics): The Symbiotes (originally known as the Klyntar) are a fictional race of amorphous extraterrestrial symbiotes appearing in American comic books published by Marvel Comics.  The Symbiotes bond with their hosts, creating a symbiotic bond through which creates a single entity.

List of NCIS: New Orleans episodes: "" is an American television series that premiered on CBS on September 23, 2014.  The series is set in New Orleans, Louisiana, and follows the stories of the members of the local office of the Naval Criminal Investigative Service (NCIS).  The program and its characters were introduced in a two-part episode during the eleventh season of the television series "NCIS" on March 25 and April 1, 2014.  On March 25, 2016, the series was renewed for a third season, which premiered on September 20, 2016.  On March 23, 2017, CBS renewed the series for a fourth season, which premiered on September 26, 2017.

Peter Miller (angler): Peter Miller is a professional angler and three-time sailfish tournament world champion.  Miller is the host of "Bass 2 Billfish" on the NBC Sports Network, which is in its 6th season.  Miller has filmed "Bass 2 Billfish" in collaboration with the Make-A-Wish Foundation, including a two-part episode that premiered in January-February 2015.  Other notable episodes of "Bass 2 Billfish" include a two-part episode filmed with the Florida Army National Guard, which premiered in February, 2015.  Miller was chosen by Florida Governor Rick Scott to be part of the "Sportsman for Scott" Coalition which supports the rights of hunters and fishers in Florida.

Do the Handicapped Go to Hell?: "Do the Handicapped Go to Hell?"  is the ninth episode of the fourth season of the animated television series "South Park", and 57th episode of the series overall.  "Do the Handicapped Go to Hell?"  originally aired in the United States on July 19, 2000 on Comedy Central.  It is the first part of a two-part episode, which concludes in the following episode "Probably".  It links the events and some of the characters of the "" into the animated series.  This episode is rated TV-MA in the United States.

The Time of Angels: "The Time of Angels" is the fourth episode in the fifth series of British science fiction television series "Doctor Who", first broadcast on 24 April 2010 on BBC One.  It is the first episode of a two-part story written by showrunner Steven Moffat and directed by Adam Smith; the second episode was "Flesh and Stone".  Moffat utilised the two-part episode to bring back a couple of his previous creations: the Weeping Angels from his series three episode "Blink", and River Song (Alex Kingston) from the series four episodes "Silence in the Library" and "Forest of the Dead".  The episode is partly set in the 51st century.

Supporting paragraphs: Spider-Man: The Venom Saga Symbiote (comics)
Answer: Venom and Carnage