Question: What is the difference between Joss Whedon and Sylvester Stallone as directors? 
Sentence (from "Joss Whedon"): He is the founder of Mutant Enemy Productions and co-founder of Bellwether Pictures, and is best known as the creator of the television series "Buffy the Vampire Slayer" (1997–2003), "Angel" (1999–2004), "Firefly" (2002), "Dollhouse" (2009–10) and "Agents of S.H.I.E.L.D." (from 2013).
Relevant evidence: Yes