XEUS is an imaginative science mission under study by ESA. If it is built, it becomes the follow up to ESA's XMM/Newton observatory, the world's most powerful tlelscope for x-rays launched in December 1999.
XEUS is imagined to be built in two stages: First XEUS-1 would be launched like a satellite, or better, two satellites; however, the x-ray mirror block and the detector module are separated by several dozen metres, and are kept aligned to extreme accuracy in orbit. The second stage of XEUS involves the International Space Station. Its logistical capabilities, and its robotic arm, will be used to assemble in orbit a telescope with 30 sqm x-ray mirror size.
This video includes a 4-minute presentation of XEUS entirely in 3-D graphic images.
The 4-minute presentation is looped untill tc 00.15.36

00.03.50 Opening title slate: X-ray Evolving Universe Spectroscopy.
ALL GRAPHIC ANIMATIONS
Ariane 5 launch with XEUS-1
Seperation of XEUS-1 from Ariane 5
Detector spacecraft with large solar panels positions 50m from mirror spacecraft
Detector spacecraft uses ion thrusters to precisely follow mirror focus
International Space Station
Shuttle launch and docking with ISS
Detector spacecraft docking with mirror spacecraft
MIrror spacecraft docking with ISS
Shuttle robotic arm removing palet with additonal mirrors and hands to ISS robotic arm
ERA adds mirror segments to mirror spacecraft
Enlarged mirror spacecraft undocks from ISS
Proton releasing new detector spacecraft
New detector docks with enlarged mirror spacecraft
Detector spacecraft follows new enlarged mirror spacecraft in new orbit
00.07.46 End of 3D Sequence. Same sequence in loop now.
00.15.36 END of TAPE