Yeah, most of them. There are some characters in Marvel Ultimate Alliance that aren't in Marvel Ultimate Alliance 2, such as Elektra, Ghost Rider, Dr. Strange and Silver Surfer, and vice versa. You get a bigger group of heroes -- and a few villians -- in MUA2.
There is a Marvel Ultimate Alliance 2 released September 15, 2009 for the PS2 but no game of Ultimate Spider-man 2 only Ultimate Spider-man ( September 22, 2005) and then Marvel Ultimate Alliance released October 24 2006
Daredevil,Green Goblin,Human Torch,Invisible Woman,Hulk,Captain America,Iron Man,Luke Cage,Mr.Fantastic,Deadpool,Juggernaught (xbox360 and ps3 pre order exclusive),Thing,Spiderman,Storm,Songbird,Thor,Iron Fist,Wolverine,Venom,Iceman,Gambit,Penance,Miss Marvel and Jean Gray.
Yes it is, in fact you should check wikipedia, The Link: http://en.wikipedia.org/wiki/Marvel_Ultimate_Alliance_2 If this link does not work try going to wikipedia by yourself and search: Marvel Ultimate Alliance 2