Conversation so far:
When was Hulk Hogan's third return to WWE?
At WrestleMania 21 on April 3, Hulk Hogan came out to rescue Eugene who was being attacked by Muhammad Hassan and Khosrow Daivari.
Did Hulk Hogan rescue Eugene successfully?
Eugene would be saved by returning Hulk Hogan, after Hogan attacked the villainous duo, Muhammad Hassan and Khosrow Daivari.
When was Hulk Hogan inducted into the Hall of Fame?
On April 2, 2005, Hulk Hogan was inducted into the WWE Hall of Fame class of 2005 by actor and friend Sylvester Stallone
What is a wrestling match Hulk Hogan did after WrestleMania 21?
On the April 18 episode of Raw, Muhammad Hassan led an attack on Shawn Michaels until Hulk Hogan appeared, saving Michaels and accepting his offer.
What was Michael's offer?
Shawn Michaels made a plea for Hulk Hogan to team with him in tag team match against Muhammad Hassan and Khosrow Daivari.
What did Michaels and Hogan do together after that?
At Backlash Muhammad Hassan and Khosrow Daivari lost to Hulk Hogan and Shawn Michaels.

Question: Was that the only time he appeared on Raw?
Self-contained rewrite: Was that the only time Hulk Hogan appeared on Raw?