In the year 2000, Toy Biz released some toys based on the Marvel Vs. Capcom cast of characters. As with their X-Men Vs. Street Fighter toys, the line was sold in packs consisting of two characters, with one Marvel character and one Capcom character. However the line was nowhere near as extensive as before, in total only 8 different characters were made available.
There were four two-packs to collect: Captain America & Morrigan, Spider-Man & Strider Hiryu, Venom & Captain Commando and War Machine & Mega Man. Each set included a diorama based on one of the video game's backgrounds and the figures came with accessories, such as clip on armor for Mega Man. The figures also had some gimmicks, such as War Machine having shoulder cannons that launched missiles.
The Marvel toys were, from what I've read, simply old toys put in new packaging, but with some of their colors slightly changed. It wouldn't surprise me if this was true because Toy Biz did the same thing for the X-Men characters for their X-Men Vs. Street Fighter toys. Anyway, if you want any of these your best bet is, as ever, eBay.