Beast Boy and Robin have a good friendly relationship, although one that is somewhat difficult due to their personality differences. The pie is then sent to the H. Titans 4 reveals that a small part of that seed still remains within him, which Trigon's sons manipulate, using the demonic energies to open the portal to Trigon's realm. One of their former members is the Teen Titan Beast Boy , who had become estranged from the team years before.