Aquaslash & Pals is a ROM hacking group led by Aquaslash (obviously), whose primary project is the Sonic 1 Hack The S Factor: Sonia and Silver. Originally, several members of the group were part of another group that worked on the ill fated Sonic One project. At that time, Aquaslash contributed sprite work to their efforts. When Sonic One was ultimately canceled, its first two zones were absorbed into The S Factor, and the Sonic One staff began to contribute to that project.
Under their hand, The S Factor grew to be even more impressive, and as some members moved on to other things in life, new members came on. The group was officially named in late 2009.